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Scholars Journal of Medical Case Reports | Volume-13 | Issue-10
When the Craniovertebral Junction Fuses: A Rare Case of Klippel-Feil Syndrome with Anterior Atlanto-Occipital Assimilation and Basilar Invagination
A. Bouelhaz, M.K. Diakité, S. Aouaq, Y. Bouktib, A. El Hajjami, B. Boutakioute, M. Ouali Idrisi, N Cherif Idrissi El Ganouni
Published: Oct. 25, 2025 |
253
102
Pages: 2564-2566
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Abstract
Klippel-Feil syndrome (KFS) is a rare congenital disorder caused by faulty segmentation of the cervical vertebrae during early embryonic development. It is often associated with other craniovertebral anomalies such as atlanto-occipital assimilation and basilar invagination, which may remain asymptomatic or lead to neurological complications. We report the case of a 61-year-old male who presented following craniofacial trauma. While the cerebral CT was unremarkable, cervical imaging incidentally revealed C2–C3 vertebral body fusion, a posterior arch defect of C1, complete anterior assimilation of the atlas to the occiput, and basilar invagination. These findings were consistent with type II Klippel-Feil syndrome. The patient remained neurologically intact. This case highlights the importance of systematic imaging of the craniovertebral junction, even in asymptomatic individuals, as congenital anomalies may predispose to instability or neurological compromise, particularly in trauma settings. Early recognition is essential for proper management and risk assessment.


